Camera trapping data in remote areas with least human activities showed that Formosan serow is active day and night with significantly more diurnal activities (74% vs. 26%, Pei and Chiang 2004). It is most active during the 3 hours after sunrise and during the 4 hours before sunset (but lower activity levels than in the morning) and seasonal variations of activity levels were more pronounced in the afternoon (Pei and Chiang 2004). However, Formosan serow could become more nocturnal in areas close to human activities (Liu 2003).